When I hold down the right mouse button and go in to mouse look, the mouse cursor will move off of focus on the game window and the cursor will leave the game window when moving the mouse and cam position in game. I am currently using build 6278

Inner Space build 6284 should work great, please let me know. This is of course the new development build, same procedure as always to switch if needed: right click Inner Space and select Patcher, tick "Download development (test) patches" and then close and restart Inner Space to let it patch up.